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CVE-2026-84411 – Unauthenticated Remote Code Execution / DoS – MikroTik RouterOS before 7.24

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Summary

CVE-2026-84411 is a critical integer underflow vulnerability (CWE-191) in the web management service of MikroTik RouterOS, triggered during HTTP request body handling before authentication takes place. An unauthenticated, remote attacker can send a single crafted HTTP request to the exposed web management interface to achieve arbitrary code execution as root or cause a denial of service. The vulnerability affects all RouterOS versions prior to 7.24 and carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: An integer underflow occurs while RouterOS parses the body of an HTTP request submitted to the device’s web management service.
  • Trigger conditions: The flawed parsing logic is reached before any authentication check, so no valid credentials or session are required to reach the vulnerable code path.
  • Attack vector: Network-based (AV:N); exploitation requires only a single crafted HTTP request sent to the exposed web management interface, with no user interaction.
  • Impact: Successful exploitation can grant the attacker arbitrary code execution with root privileges on the device, or crash the web management service, resulting in denial of service. Confidentiality, integrity, and availability impacts are all rated High.

Affected software

  • MikroTik RouterOS versions prior to 7.24 (all devices exposing the web management service)
  • Fixed in RouterOS 7.24 and later

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade affected devices to RouterOS 7.24 or later, available from MikroTik’s official download page (mikrotik.com/download).
  • If immediate patching is not possible:
    • Restrict or disable exposure of the web management interface to the internet; limit access to trusted internal networks only.
    • Place management interfaces behind a firewall and isolate them from business/production networks.
    • Require remote administrators to connect via VPN rather than exposing the web management service directly.
    • Monitor for anomalous or malformed HTTP requests to the management interface as part of a defense-in-depth strategy.

References

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